i have a big calico bristlenose boy in a heavily planted/heavily driftwooded 55g with 4 others. The first day in he claimed a spot underneath this rock/driftwood arrangement and lately he has been getting in and and laying upside down. just shifting around to a comfortable position upside down. i thought he was sick but upon closer inspection, i noticed his fins were moving and fanning himself like he was hot. is he sick? tank temp is about 74-75. consistently.